Question

Which of the following ordered pairs is a solution to the system of linear equations below?
Three x plus y equals nine. Two x minus two y equals fourteen.

(2, 3)

(3, 2)

Four, negative three.

Negative three, four.

Answer 1

3x+y=9
2x-2y=14

write it out so it is easier to visualize

Answer 2

Didn't you solve a 3 variable system of equations? Anyways,

3x + y = 9
2x - 2y = 14

3x *(-2) + y*(-2) = 9*(-2)
2x*(3) -y*(3) = 14*3

-6x -2y = -18
6x -6y = 42

0 -8y = 24
/-8 /-8

y = -3

Now you solve for X. Plug in Y.

Answer 3

3x+y=9
2x-2y=14

Answer 4

Can you do it? If you want I can guide you along it. :)

Answer 5

I'm confused :)

Answer 6

Sorry, k. So when you plug in Y for your first equation you should get.

3x + (-3) = 9

A positive and a negative = negative

So this is: 3x -3 = 9

add 3 to both sides to leave x alone on the left.

Answer 7

x=4 right?

Answer 8

Yup!! So now plug in x and y and it should give you 9 = 9

When it does those are your coordinates!!

Answer 9

Where do i plug in what?

Answer 10

xD you keep changing your picture lol um plug in x and y

3(4) + (-3) = 9

Answer 11

*proves

Answer 12

Fake?

Answer 13

I said It proves I'm not fake

Answer 14

Cause alot of people say im too pretty to be real lol

Answer 15

That means 2 things lol xDDD and yea, um 3*4 - 3 = 9

3*4 = 12

12 - 3 = 3

12-3 = 9

9 = 9 Solution!! It works. You plug it in for the other equation and see if its true

Answer 16

12 - 3 = 9 *

Answer 17

The solution works right?

Answer 18

Then does are your coordinates. (4,-3)

Answer 19

Yes lol, did you plug it in to see if it works for the other equation? Cx

It's (4,-3) I can see its 14 = 14 just by looking at it

Answer 20

Did you understand though? It's pointless for me to do your work if you don't understand, you'll just be lost during your exam... take it from experience <- :$
:)

Answer 21

@TTP did you understand :D